Sofa



FIG. 1 shows a perspective view of the sofa;

FIG. 2 shows a front view of the sofa;

FIG. 3 shows a left side view of the sofa;

FIG. 4 shows a right side view of the sofa;

FIG. 5 shows a top view of the sofa;

FIG. 6 shows a rear view of the sofa; and,

FIG. 7 shows a bottom view of the sofa.

The broken lines shown in the drawings are understood to represent stitching. 

The ornamental design for a sofa, as shown and described. 